British Journal of Ncbi Nlm Nih Form

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Imagine that you are not watching  the microcosmos right now. Instead, imagine you are living in the world as  it existed around one billion years ago,   and you are the ancestor of this red algae. Inside of you lies the DNA that you have  painstakingly acquired from your ancestors. It contains the instructions for everything from the walls of your cellular   body to the components of your organelles. That DNA has changed and accumulated through  randomness and selection over billions of years,   and you are the masterpiece  sculpted by that process. Except you are about to lose  a quarter of your genes. The history of red algae can be told  in part through what they have gained,   lost, and given away over billions of years. It begins with a tale that is familiar  to many of us in the microcosmos. A long, long, long time ago, a eukaryote consumed   a cyanobacterium, only to convert it into a  photosynthetic organelle called a plastid. This process is known as endosy